cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A207649 E.g.f.: Sum_{n>=0} 1/n! * Product_{k=1..n} ((1+x)^k - 1).

Table of values

n a(n)
0 1
1 1
2 2
3 9
4 60
5 580
6 7380
7 119700
8 2387280
9 57211056
10 1615703040
11 52950688560
12 1988213895360
13 84622184412480
14 4045503794492160
15 215531680987022400
16 12709328457015590400
17 824497514996060505600
18 58531734588587835294720
19 4525412571041289046479360
20 379428698362674642409728000
21 34365923697307101211784908800
22 3350637193653655199937586944000

List of values

[1, 1, 2, 9, 60, 580, 7380, 119700, 2387280, 57211056, 1615703040, 52950688560, 1988213895360, 84622184412480, 4045503794492160, 215531680987022400, 12709328457015590400, 824497514996060505600, 58531734588587835294720, 4525412571041289046479360, 379428698362674642409728000, 34365923697307101211784908800, 3350637193653655199937586944000]